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STATUS_OFFLOAD_READ_FLT_NOT_SUPPORTED
A filter blocks creation of the copy-offload token
ODX begins with FSCTL_OFFLOAD_READ, which asks the source stack for a token representing a point-in-time range of file data. This status means a file-system filter on the path cannot safely support that operation. It is distinct from the source file itself being unsuitable or the storage device lacking copy-offload capability.
Because offloaded movement occurs below normal host reads and writes, filters that transform, scan, encrypt, deduplicate, virtualize, or otherwise depend on seeing the data path may need to reject it. A correct copy engine can fall back to a conventional buffered or unbuffered copy while preserving the original data semantics.
What to inspect
- Identify the source volume filter stack and the filter that completed FSCTL_OFFLOAD_READ.
- Record file attributes, reparse points, encryption, compression, and virtualization state.
- Confirm the caller handles partial offload and fallback without treating the token failure as data loss.
- Do not detach security or data-transform filters merely to force ODX.
References
- Microsoft Open Specifications: NTSTATUS values
- Microsoft: Windows Offloaded Data Transfers
- Microsoft Open Specifications: FSCTL_OFFLOAD_READ
- Microsoft: ODX compatibility guidance
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